Accounts Payable and Accrued Liabilities

12 Months Ended

Dec. 31, 2020

Payables and Accruals [Abstract]

Accounts Payable and Accrued Liabilities

Accounts Payable and Accrued LiabilitiesAccounts payable and accrued liabilities consisted of the following (in thousands):

	December 31,
	2020		2019
Accounts payable	$	18,117	$	16,367
Accrued clinical expense	32,240		21,290
Accrued development and other expense	7,151		2,510
Accrued compensation and benefits	13,964		7,915
	$	71,472	$	48,082

The long-term liabilities balance of $2.0 million as of December 31, 2020, and $1.0 million as of December 31, 2019, consisted primarily of clinical trial-related liabilities.